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The technology of black coloring for stainless steel by electrochemical method was studied. The optimum bath compositions and operating conditions were obtained as follows. 40 - 50 g/L K2Cr2O7, 15 - 20 g/L MnSO4, 15 -20 g/L (NH4)2SO4, 20 -40 g/L H3BO3, 20 -30 g/L additive A, 2 g/L (NH4)6Mo7O24 ; time 9 -20 min; temperature 15 - 30 ℃ ; potential 3 V and current density 1 - 2 mA/cm^2. The effects of the compositions of the bath on the quality of black colored film were discussed. The influences of passivation process on the black coloring velocity and performances of black colored film layer were investigated. The results show that the passivation process can improve the corrosion resistance and the stability to bear color-change; (NH4)2 SO4 can control the black coloring velocity and prolong black coloring bath life remarkably; and additive A can improve the evenness and compactness of black colored film layer. The results of scanning electron microscopy and energy dispersive spectra show that the microstructure is of cylindrical lump, the filling process can decrease the crackles, and the main elements of black colored film are Fe, Cr, Mn and Ni. 相似文献
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1 Introduction Electroless plating tin and tin alloy is an attractive technique to produce function plating layer with prior performances of corrosion resistance and decoration[1, 2], due to the possibility of uniform deposition on complex shapes, conduct… 相似文献
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对德州电厂1号汽轮机组在经过DEH控制系统改造后高压主汽门杆发生蒸汽泄漏的原因进行了分析,认为蒸汽泄漏是热态时阀门开度不足所致。通过调整热控参数,消除了热态时阀门开度不足问题,主汽门杆再未发生蒸汽泄漏。 相似文献
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碱性铝电池作为一种新型高比能动力电池,近年来由于其优异的电化学性能正受到越来越多的关注。综述了多年来铝合金阳极材料在碱性溶液中活化机理的研究情况,元素合金化的作用以及析气缓蚀剂等的研究进展,并指出了铝合金阳极材料的发展方向。 相似文献
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根据华能德州电厂5号锅炉屏过出口联箱管座焊口泄漏情况,分析了管座焊口产生泄漏的原因,提出了相应有效的改进措施。 相似文献
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